I'm trying to send a message with strikethrough text in it, and came across this question and its answers, but it doesn't seem to work for Skype for Business.
I've tried:
~text~
The keyboard shortcuts page on the Microsoft website only seems to list italics, bold and underline, and the options under "Change font..." only list those three.
Ctrl+B Make the selected text bold.
Ctrl+l Italicize the selected text.
Ctrl+U Underline the selected text.
Currently, the only thing that seems to work is creating strikethrough text in another application (e.g. Microsoft Word) and pasting it into SfB.